This document outlines security concepts and systems for biosafety labs. It describes elements of security systems like clear zones, barriers, lighting, locks, and electronic security systems. These elements work together in concentric "rings of security" to deter, detect, assess, delay, and deny threats. The document also provides a hypothetical scenario of terrorist operatives surveilling and breaching security at several facilities, ultimately stealing biological materials from Plum Island Animal Disease Center due to weaknesses in its security systems.